<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>字体间隔</title>
  <style>
    /* 下划线 */
    .tqjc1{
      text-decoration: underline  dotted green;
    }
    /* 中划线 */
    .tqjc2{
      text-decoration: line-through wavy red;
    }
    /* 上划线 */
    .tqjc3{
      text-decoration: overline;
    }
    /* 没有划线 */
    .tqjc4{
      font-size: 20px;
      text-decoration: none;
    }
  </style>
</head>
<body>
  <div class="tqjc1">I have a dream.天桥嘉成</div>
  <div class="tqjc2">天桥嘉成</div>
  <div class="tqjc3">天桥嘉成</div>
  <a class="tqjc4" href="https://www.baidu.com">天桥嘉成</a>


  
</body>
</html>